1 Rescu, Li Ka Shing Knowledge Institute of St. Michael's Hospital, 30 Bond Street, Toronto, Ontario M5B 1W8, Canada; Division of Emergency Medicine, Department of Medicine, University of Toronto, Toronto, Ontario, Canada. Electronic address: lins@smh.ca.
2 Department of Emergency Medicine, University of Pittsburgh School of Medicine, 400A Iroquois, Pittsburgh, PA 15260, USA.
3 Rescu, Li Ka Shing Knowledge Institute of St. Michael's Hospital, 30 Bond Street, Toronto, Ontario M5B 1W8, Canada; Division of Emergency Medicine, Department of Medicine, University of Toronto, Toronto, Ontario, Canada.